All my carbon prints are "flipped". I make "single-transfer" carbons which means the image is always flipped. I compose my images with this in mind...seeing the image already "flipped" on the ground glass makes it a bit easier.
My images tend to be landscapes on a more intimate scale compared to the "Grand Landscape", so usually the rocks, trees and creeks I photograph are rarely identifiable as a specific place. Though I have a nice carbon of Yosemite Falls, with tourists in front of me, and an interpretive sign on the right...but left in the print. You can read the sign with a magnifying class. Sort of a nice discovery if someone takes the time to look at the print.
What's right side up and upside down? Right and left? Our eyes build up images that are in the same orientation that we see on a view camera's ground glass. It is the software (our brain) that converts (flips) the images. In my case I know the software my brain is running on is pretty old and has a few bugs in it, more than likely. With all this flip-flopping around, I figure it doesn't make much difference which way it ends up.
I even have some negatives I both carbon print and platinum print. One is the mirror image of the other, but each has a very different feel...from the composition to the very different characteristics of the two processes. (at least the way I print them, anyway). Which one is orientated properly? Perhaps both are.
I don't remember ever printing/presenting an image upside down, though.
Vaughn
PS...I remember early in my use of view cameras, I had my head stuck under the darkcloth of a 4x5 for a long time. I distinctly remember taking the darkcloth off, straightening up and looking around me -- everything seemed to be upside down...most odd.